Thanks for the quick reply Breeze. My dilemma is that despite the outrages nitrate levels (80 - 100), the livestock seems unaffected and even thriving. I worry about an catastrophic crash though. I have a Diamond Goby who sifts the sand thoroughly and quite a few burrowing snails, so the sand is moved a lot now. I have a Koralia 1 shooting a stream across the tank and thinking of adding a second one (or a mod'd Maxi-Jet 1200) aimed at the back to eliminate any dead spots. I'm using the stock return pumps and a Maxi-Jet 1200 to power the chiller, so flow seems adequate. Adding a refug with chaeto and a better skimmer (may opt for the HOB refug/skimmer) should help. Removing or partially removing the sand is an option, but I'm hesitant to do that right away cause of the stress to the livestock, especially the Diamond, and cause it's a lot of work. At this point and as long as the livestock seem fine, maybe I should continue with the water changes, the mentioned mods and keep hoping for better nitrate levels. I just don't want the entire tank to crash. Thoughts? Thanks in advance.
G